Product details:

It's designed for commercial sectional applications. This Liftmaster jackshaft operator is compatible with doors that measure up to 14' in height and up to 18' wide. It has a recommended duty cycle of 10 cycles per hour to maintain a usable life. This Liftmaster 3900 garage door opener is not compatible with low headroom applications. Its compact design is ideal for limited height cathedral or obstructed ceiling installations. The Liftmaster/Chamberlain/Sentex 3900 Light-Duty Commercial Jackshaft Operator can be mounted on the left or right side of the door and attaches to the tension bar. It has a heavy-duty 24VDC motor that provides ultra-quiet operation for a smooth start and stop.